What happens in the embryo during the trimesters of pregnancy?

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I’m taking a Biology class, and i need to know the most important events that happen during the trimesters of pregnancy. I need to know what happens in the embryo or something during the first trimester, and then what happens in the second trimester, and then the third. I’ve tried googling it, but the only things that come up are what happen to the women and not the embryo, so PLEASE help me!!
yeah, the thing is, i left my biology book at school… and I don’t have any books that have anything to do with an embryo at home…

Okay, I know I won’t get credit for the best answer. But have you considered looking in an Embryology textbook? Sometimes original sources, not the web, are still the best source.